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AIX 5L Practical Performance Tools and Tuning Guide by IBM Redbooks

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7.3. Tuning

In order to effectively tune the storage layer, it is important to understand the workload generated by the application. Without a good understand of the workload, and the subsequent load that is placed on the storage, tuning will likely be ineffective. Worse than that, improper tuning can degrade performance. Tuning cannot make up for bad data placement and design.

This section covers the commands that can be used to tune the I/O layer. For the discussion of data placement and design see.

7.3.1. The lsdev, rmdev and mkdev commands

When tuning disk storage you often need to work with the adapters and disks. Some tuning requires that the device is made unavailable (changed from available to defined). A major change like installing ...

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